Well i got my CPC theory test a week today.
Picked the CPC book up and what a load of useless ■■■■ it is…
I really have no idea how to prepare for this test now…
Sorry rant over! Google search here i come!
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Common sense, theory book and possibly the driving goods vehicles book will see you through ok
I’m in the same situation, there seems to be so little info on it!
I’m registered with Driving Theory Test Practice Material for the DVSA Theory Tests through my trainer. It has some CPC case studies to practice (about 30 in total), although they are only mock ups but give you a good idea as to what to expect. I don’t actually think there is any training material out there. Just use your common sense, take your time and think about the answers. I think a good read of the DSA Guide to Driving Large Goods Vehicles would help with this one.
P.S. I have my CPC theory test in about a week too. Good luck! 
drivingtheory4all.co.uk/Publ … Today.aspx
Its up to you as to whether you pay for it though.
EDIT click on the LGV CPC tab. Think you get 28 days for £15.